Sub-top for a gas range



FIG. 1 is a perspective view of a sub-top for a gas range appliance showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof, and

FIG. 5 is a side elevational view thereof. 

The ornamental design for a sub-top for a gas range, as shown and described. 